      3   1 Identifier a
      3   3 Op_assign
      3   5 Integer 1071 
      3   9 Semicolon
      4   1 Identifier b
      4   3 Op_assign
      4   5 Integer 1029 
      4   9 Semicolon
      6   1 Keyword_while
      6   7 LeftParen
      6   8 Identifier b
      6  10 Op_notequal
      6  13 Integer 0 
      6  14 RightParen
      6  16 LeftBrace
      7   5 Identifier new_a
      7  11 Op_assign
      7  13 Identifier b
      7  14 Semicolon
      8   5 Identifier b
      8  11 Op_assign
      8  13 Identifier a
      8  15 Op_mod
      8  17 Identifier b
      8  18 Semicolon
      9   5 Identifier a
      9  11 Op_assign
      9  13 Identifier new_a
      9  18 Semicolon
     10   1 RightBrace
     11   1 Keyword_print
     11   6 LeftParen
     11   7 Identifier a
     11   8 RightParen
     11   9 Semicolon
     12   1 End_of_input
